Typewriting-machine



B. C. STICKNEY.

TYPEWRITING MACHINE.

'APPLICATION FILED IIIAII. e. I9III,

muted ont. 26,1920.

I/l//knesses BURNHAM C. STICKNJEY, OF ELIZABETH, NEV JERSEY, ASSGrhTlSL '3;0 UNDERWOOD TYPEWRITER COll/PANY, OF NEW YORK, N.

Y., .Pa CURPRATIN F DELAl/VARJE.

TYPEWRITING-MACHINE.

Application filed March 6, 1918.

To all fr0/wm t may concern Be it known that l, BURNHAM C. STICK- NEY, a citizen ot' the United States, residing in Elizabeth, im the county of Union and State ot New Jersey, have invented certain new and useful Improvements in Typewriting-Machines, oit which the following is a specification. y i

This invention relates to line-spacing mechanism of typewriting machines, and is in the nature of an improvement in the means for varying or regulating the linespacing movements of the platen. 'lhe invention is illustrated as applied to an Underwood typewriting machine in which the platen is revoluble; but it is also applicable to other types of machines and. other types of platens.

lt is usual in these machines for `the line-- spacingf mechanism to be regulatable, so as to give the platen a single, double or triple l throw at each line-spacing` operation. For

this purpose, the ratchet wheel is usually connected to the platen, and a pawl which drives the ratchet wheel is operated by a lever, and a variety of mechanism has been employed for controllingl the pawl so that at` each stroke of the line-spacing lever it will give the ratchet wheel a rotation ol one, two or three teeth.

My invention relates to means for provid` ing an additional regulation of the linespacing,r mechanism, and `particularly to make it convenient to give the platen a throw that is greater than one tooth and less than two teeth of the line-space wheel; this special movement ot the platen being' illustrated in the drawings as amounting to a distance equal to one and one-halt of the teeth of the linesspace wheel.

Accordingly, one feature of the invention resides in theprovision of means whereby a single line-space regulating handle or part may be shifted to any of tour positions correspondinpr to one, one and one-half, two and three steps of platen movement.

@ther objects of the invention are to simplify and improve the mechanism for securing either whole or fractional line-space movements of the platen, to produce an inexpensive mechanism ot this character and one which can be adapted to existing' machines at moderate expense and without the employment of many additional moving parts.

Specification of Letters Patent.

Patented filet. 2h, i922@ serial no. aearii.

ils or single, double and triple spacing there is employed the usual ratchet wheel. l? or fractional spacing there may be, employed an additional ratchet wheel having twice as many teeth as the lirst; said'ratchet wheels beingl preferably connected rigidly together. To the slide which is usually provided in said Underwood machine for operation by the line-spacing lever, l may pivot 'two pawls, one for the coarse-tooth ratchet wheel and one for the hne-tooth ratchet wheel, and both pawls are moved backward and ton ward by said slide at every operation of the line-space levern @ne of the features ot the invention may be a provision whereby either pawl may loe held away trom its ratchet wheel, so that either pawl shall move idly the line-space strokes ot' the other pawl.

rlfhe effectiveness of the pawls is controlled by the l1ne-space regulator. rillhis regulator, besides having` a position lor single spacing, another position tor double spacing, and an* other position tor triple spacing, may have a special position between the single-spacingr and doublespacmepositions, at which position it so controls the pawls that the pawl tor the coarse-tooth ratchet is out ouse, while the pawl :tor the line-tooth ratchet is in use.

The regulation ot the activity of the pawl lorthe coarse-tooth ratchet may be effected by means working upon the usual principle in the Underwood typrewritingD machine, which' is, that a guard is provided lor such pawl tothold it out of mesh with the ratchet wheel duringa a certain part of the stroke ot thedne-space lever; said guard being shittablt to'three diderent positions to permit the pawl to drive the ratchet wheel to the extent of one, two or three teeth, as required. i guard may also be provided lor the pawl that drives the line-tooth ratchet wheel, but said guard in the present instanceis not shiftable but iixed, and constructed so that it permits its pawl to drive the ratchet wheel to the extent of three teeth in all cases; so that the line-tooth ratchet wheel is only used 'where the platen is to be given a line-space movement equal to one and a halt oil a single line-space.

'llhe usual line-space regulator also advantageously operates means :tor controlling the detents which are provided for the ratchet wheels. When the detent is in a position tor either single, double or triple spacing, the detill tent for the coarse-tooth ratchet wheel may be permitted to be effective, while the detent for the fine-tooth ratchet wheel is held out of use; but when the atter ratchet wheel is in position for spacing the platen one and a half of a single space, the reverse may be the case, the detent for the coarsetooth ratchet wheel being Yheld out of use while the other detent is permitted to be effective. rFhis detent-controlling means may include a double cam mechanism for selectively releasing the platen-detents.

`When it is desiredto release the platen from the control of the ratchet wheels, both detents may be released, and this is prefer ably done by means of a single stroke of a single releaser, which is adapted to operate upon one of the detents in a well-known manner to cast it off from its ratchet wheel. said detent having a lug which engages `the v other detent Jor casting that 0R also.

@ther features andY advantages will hereinafter appear.

1n the accompanying drawings,

Figure 1 is a side elevation of the carriage of an Underwood front-strike typewriting machine provided with the present improvements; some of the parts being broken away, and the line-space 'regulating mechanism being in position for single spacing of the platen.

Fig. 2 is a sectional front elevation taken about axially ,of the platen and showing parts that are seen at Fig. 1.

double-cam mechanism Fig.'3 is an enlarged detail view of the for selectively releasing the platen-detenta Fig. t isa diagram of the l1nespace regulating mechanism seen at Fig. 1, but showing the regulator set to permit a throw of the platen equal to one and a half single spaces.

Fig. 5 is a part-sectional plan view of parts seen at Fig. 1.

Fig. 6 is a perspective view of the doublecam seen at Fig. 3 Jfor selectively casting o the platen-detenta Fig: 7' is a skeleton perspective view showing the principal features of the mechanism; the parts being in the position seen at Fig. 1 Y

Fig. 8 is a view showing how the, platen is prevented from overthrowing by one of the line-spacing pawls at the end of a linespacing operation.

rlI.`he revoluble platen 10 is mounted on an axle 11 in a platen trame 12, comprising ends 13 and a main back portion 14C. The platen axle 11 is provided with a coursetooth ratchet wheel 15,'which may be similar to that commonly used for effecting single, double and triple spacing ot the platen. rThis ratchet wheel may be engaged by a driving pawl 16 pivoted upon a slide 17 which is driven rearwardly by a movement against Lawaai of the usual line-spacing handle 18, which is pivoted upon a carriage 18' which carries the platen frame 12; the slide being returned by a spring 19 after actuation. detent-roll 20 Aengages the teethof said ratchet wheel 15to hold the platen during the typing operation, said roll 20 being carried upon an arm 21, which is pivoted upon a stud 22 upon the platen frame, and caused by a spring 23 to press the roll 20 into the notches vof the ratchet wheel.

Said pawl 16 is normally out of engagement with the ratchet wheel 15 to permit the platen to be turned freely in either direction by means of the usual hand-wheel 24 on the platen axle. The pawl 16 is held thus elevated by means of a guard 25, Figs. 2, 5 and 7, upon which rests a toe 26, which curves rearwardly and downwardly from the pawl. As the pawl-carrying slide 17 is retracted, theinclined edge of the toe 26 engages the rear edge of the guard 25 and is thereby cammed upwardly, thus withdrawlng the pawl 16 from the ratchet wheel, the tension of a spring 16a which tends to hold the pawl in engagement with the ratchet wheel, until the toe rests upon the guard. r1`he spring 16a may be carried by the pawl and bear against a pin 17 a on the slide 17, Fig. 2.

|The guard 25 is shiftable to any one of three "positions by means of a regulating lever or handle 27 pivotedupon the platen axle and connected to a slide 28 upon which said guard is :formed or provided; a detent 29 being provided on a downward extension 30 of the lever to engage holes or depressions 31 in one of the ends 13 of the frame 12, to detain the lever at any station to which it may be set. When the regulating lever 27 is at the position seen at Fig. 1, the guard 25 is in position to hold the pawl 16v out of the ratchet wheel for a maximum portion of the line-spacing stroke,'so that said pawl is delayed in engaging the ratchet wheel, and hence can move the latter to the extent of only a single tooth thereof; the` pawl 16, slide 17 and ratchet wheel 15 being finally arrested by the engagement of the pawl with a stop 32, which will hereinafter be more clearly described.

When the line-space regulator or lever 27 is in its extreme forward position, the eX'- tent of the idle stroke of the pawl 16 is reduced to a minimum, or, in other words, it is allowed todrop into engagement withl the ratchet wheel assisted by the spring 16 at p the early part of ,the line-spacing stroke, and hence the platen is driven to the extent of three teeth of the ratchet wheel, thus making a triple line-spacing movement of the worksheet on the platen. `When the line-spacing regulator 27 is at the station just forward of the station just mentioned, the guard 25 will permit the pawl to engage the ratchet wheel at a point to make only a double space of the platen, as will be understood by those skilled in the art.

Tn addition to the coarse-tooth ratchet wheel 15 just described, there is employed a special ratchet wheel 33 which may be lixed to the platen axle and which has preferably twice as many teeth as the coarse-tooth ratchet wheel 15, so as to be capable of imparting to the platen a line-space movement of one and a half spaces at each stroke, this being equal to three teeth of said tine-tooth ratchet wheel. To engage this second ratchet wheel, there isprovided a second pawl 34, which may be also pivoted upon said slide 17, and which may also stand normally out of engagement with its ratchet wheel 33, said pawl having a toe 35 curving rearwardly and downwardly therefrom to rest normally upon a guard 36, which, in this instance, is fixed to the platen frame, since this paw'l is used only for advancing its ratchet wheel to the extent of three teeth thereof, so that regulation of the position of the guard is not necessary; although the invention is not limited to a fixed or unregulatable guard or controller. The pawl 34 is provided with a spring 34a, which also bears against the pin 17a on the slide 17 and assists to move the pawl 34, when actuated, into engagement with the ratchet wheel-33.

To maintain this second pawl entirely out of use pawl, there is provided a rest35, which is in the form of a shoulder on a bar 36', Fig. 7, extending transversely of the pawls beneath the same, said bar having'also a resty 37 for the first pawl 16, so that it is capable of holding either pawl entirely out of use. Between the rests is an opening 38 in said bar, in which opening either pawl may work when the other pawl is supported upon its rest. This rest-bar 36a may be adjusted when both pawls are resting upon their guards, that is, when both pawls are in normal positions.

The pawl-rest-bar 36a is preferably connected to the line-space regulator 27, aforesaid, so that when said regulator is at a station between its one space and two' space stations, the rest 35a will be withdrawn from the pawl 34 which drives the fine-tooth ratchet 33 and will be in position to hold the other pawl 16 out of use. This shifting ot' the rest-bar may be effected by. a bent or cam-portion 39 ofa rod 40, which is pivoted to the line-space regulating lever and works in an eye or aperture 41 formed in the bar 36, which may be camrned endwise by said regulating lever; the bentportion forming a double cam to engage the edges of the aperture 41 in the bar 36a, and thereby control the position of the same; said double cam coming into use as the regulator 27 is moving between its first and third during the driving action of the first` vsecured to the slide 28 stations, the four stations being provided for 'said regulator, as seen by the detents at Figs. 1 and 4. Thus, the movement ot the regulator from its first to its second station can not regulate the stroke of the pawl 16 which drives the coarse-tooth ratchet l5, but renders said pawl 16 ineffective and bringsthe other pawl 34 into use; while the movement of said regulator from its second station to its third station puts out of use the pawl 34 which drives the fine-tooth ratchet 33, and restores to use the other pawl 16, and simultaneously regulates the length of stroke of said pawl 16, to make double snacing of the platen; while the further shi ting of the regulator 27 from its third station to its fourth station has no further effect upon the pawl 34 which drives the fine-tooth ratchet Wheel 33, but regulates the stroke of the other )awl 16 so that it effects a triple spacing o the platen.

llt should be understood that, although the regulator-handle 27 may be moved to four stations, the guard 25, which is controlled by said handle, is moved only to three positions, for one, two and three line-spaces. To do this, I have provided a lost-motion connection between said regulator and the slide 28 which carries said guard 25, so that the regulator, when moved from the one linespace positionto its one and a half linespace position, does not shift the guard 25, as it is not necessary to do sov at this time. This connection may comprise a pin 28a and which projects into an elongated slot 27a formed in the regulator or regulating handle 27, to permit a movement of the regulator independently of said slide. A spr-ing 28b is provided which normally holds the slide 28 in its rearmost position, Fig. 1, where it is arrested against the stud 22 upon which it is supported. This spring assists in restoring said slide, but isnot strong enough to overcome the holding effect of the detent 29. By an inspection of Fig. 4, it will be 'seen that the regulating handle has been moved to its one and` a half line-space position, and that the slide which carries the guard 25 has been left undisturbed. 'Tt will further be seen that a continued movement of the regulating handle 27 will be effective to move the guard 25 therewith, thus shifting it to a position for two or three line-spaces.

Indices 1, 14, 2 and may be provided to indicate the different positions to which the regulating handle 27 may be set. These may be provided on a plate 13 forming part of the platen frame 12, and may be arranged adjacent to said handle.

There is provided for the fine-tooth ratchet wheel 33 a special detent-roll 42 carried upon an arm 43, which is also pivoted upon the stud 22, and which is caused space wheel 20 to control the by a spring 44 to press'the roll 42 into the notches of said wheel 3S. lither detent may be brought into use while the other is cast oit', and this is preferably done automatically, and for this purpose a connection, including a link 45, may be made whereby said detent-arms may be controlled by the line-space regulating lever 27. rllhe link 45 may be pivoted upon the same stud that carries the detent-arms; and upon this link or bar 45 may be arranged two cam members 4G, 47, to cooperate, respectively, with pins 48 and 49 provided upon the detentarms 2l and its the regulator 27 i is moved to its second station, whereby the main pawl 16 is made inedective and the auxiliary pawl 34 is brought into use, the cam on said bar 45 engages the pin 48 on the corresponding detent-arm 21 and forces said arm away from the ratchet wheel l5, while at the same time the pin 49` provided upon the other detent-arm 43 falls into a notch or clearance 50 provided upon. said earn 4'?, so that the detent 42 may then engage the notches of the {ine-tooth ratchet wheel 33. the line-space regulator 2'? moves from its second to its third station, the first cam 46 is withdrawn from the first pin 48, thereby restoring the detent coarse-tooth ratchet wheel 15, while the steep slope 51 in the other cam 47 forces the pin 49upon theV other arm 43 to lift the detent-roll 42 out of the finetooth ratchet wheel 33. 'llhus adjustment of the regulator 27 to its different stations has the effect of either regulating the extent of movement imparted to the platen by one line-space wheel, or of making one lineineffective and putting the the control of the other linerllhe invention, however, is

to the use of a sepfor each lineplaten under space wheel. not limited in all cases arate pawl or separate detent space wheel.

To release the platen from the control of both the line-space detents 2O and 42, there is provided a silencing cam 52 of much the usual Underwood form, having a handle 53 and pivoted upon the platen axle, the cam acting upon studs 54 and 55 projecting from thedetentarms 43 and 21, respectively, to cast the detents ed from their ratchet wheels.

'llo avoid any possible overthrow of the platen,'which may be caused by its momentum during line-spacing operations thereof, the stop 32, hereinbefore mentioned. is in the forml of a cam, with which the projection 57 formed on the line-space pawl 16 may engage at the end of the :stroke of said pawl, Fig. 8, so that said pawl will be held against the ratchet wheel 15 and between the teeth thereof, thus preventing overthrow of said platen. llt will be seen that the stop 32 is formed on the rest-bar 36a;

vtion of said actuating means,

' in either first, third retrasa this is done so that it may be moved into effective relation with the pawl 34 for a. similar reason,thus to prevent the overthrow of the platen at the end of a linespacing operation by the pawl 34. It will further be seen' that the holding effect of the stop 32 may be increased by changing the angle of the inclined face thereon.

ln view of the fact that a detent-roller has a better action on a ratchet wheel of coarse teeth than on one of tine teeth, l preferably use two ratchet wheels for linespacing the platen, as above described, the ratchet wheel 15 with the coarse teeth being .the one used for most purposes.

lt should be understood that one of the objects in employing a pawl for each linespace wheel, and having them both pivotally mounted on the line-space slide 17, is to avoid, as much as possible, the shifting of parts when changing from one line-space wheel to another.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

l'laving thus described my invention, l claim:

1. 'lhe combination of a platen, two ratchet wheels having teeth of different pitch, means for actuating said ratchet wheels, a finger-piecejand means actuable by said finger-piece for controlling the acso that the latter may be effective on one of said ratchet wheels to turn the platen through one or a plurality of line-space distances, or may be rendered ine'ective on that ratchet wheel and eilective on the other.

2. 'llhe combination of a platen, a plurality of ratchet wheels connected therewith, said ratchet wheels having teeth of different pitch, actuating means for said ratchet wheels, a inger-piece, and means sett-able by said linger-piece to render said actuating means effective on one of said ratchet wheels to cause a one-linespace movement or movement of a plurality of line-spaces, or ineffective on said ratchet wheel and effective on another.

3. 'lhe combination of a platen, two linespace ratchet wheels therefor, two pawls, one for each ratchet wheel, actuating means ifor said pawls, a regulator member movable to four positions, and means controlled by said member whereby when said member is or fourth positions, one of the pawls will -be ated by said actuating means to move the platen one, two or three line-space distances,`respectively, and when said member is in the fourth position that pawl will be ineffective and the second pawl will be edective when oper-A rendered effective on the second ratchet l wheel.

space wheels therefor, two line-space pawls, one for each line-space wheel, actuating means for said pawls, a regulator member, means controlled by said regulator member for determining the number of line-spaces the platen will be moved by said actuating means, while one of said pawls is effective, and means controlled by said regulator member to render either of said pawls effective with respect to its line-space wheel, and concomitantly render the other pawl ineffective on its line-space wheel.

5. The rcombination withfa platen and two line-space wheels connected `therewith, of two line-space pawls, one for each of said wheels, means to actuate said pawls, a regulator to render one of said pawls effective to move the platen through different angular distances, and means controlled by said regulator whereby either of said pawls will be rendered effective and the other ineffective.

6. The combination of a platen, two linespace wheels on said platen, two line-space pawls, one for each line-space wheel, means to actuate said pawls, Va regulator for determining the throw of said platen and for selectively rendering either pawl effective, a movable guard for one pawl, and a fixed guard for the other pawl.

7. The combination of a platen, two linespace wheels on said platen, two line-space pawls, one for each line-space wheel, means to actuate said pawls, and a regulator, one of said pawls being effective yto move said platen through various angular distances, the other pawl being effective to move said platen always through the same angular distance, both of said pawls being under the control of said regulator.

8. The combination of a platen, two linespace wheels on said platen, two line-space pawls, one for each line-space wheel, means to actuate said pawls, a regulator, a movable guard for one pawl, a fixed guard for the other pawl, and means connected to said regulator to render either one of said pawls effective, said movable guard being also connected to said regulator.

9. rThe combination of a platen, a plurality of line-space wheels on said platen, a plurality of line-space pawls, one for each line-space wheel, a single line-space handle for actuating said pawls, and means for selectively rendering any one of said pawls effective. with its associated line-space wheel, said means comprising a slide having a plurality of rests, one foreach pawl, said slide having' also a slot therein which may be moved underneath the effective pawl.

10. rlhe combination of a platen, a plurality of line-space wheels on said platen, a plurality of line-space pawls, one for each line-space wheel, a single line-space handle for actuating said pawls, and means for line-space wheels therefor, v pawls, one for each line-space wheel, actuselectively rendering any one of said pawls effective with its associated line-space wheel, said means comprising a slide, a pivoted handle, andA a cam controlled by sil handle, said handle acting on said s1 e.

l1. The combination of a platen, two

ating meansfor said line-space pawls, a movable element to permit one of said pawls, when actuated, to come into engagement with the line-space wheel at various positions in the range of movement thereof, a regulator connected to said element, a fixed element for the other pawl which permits the latter to engage its associated linespace wheel always at the same position in its range of movement, and means to permit only one pawl at a time to come into engagement with its associated line-space wheel.

12. The combination of a platen, two linespace wheels therefor, two line-space pawls, one for each line-space wheel, actuating means for said line-space pawls, a movable guard for one of said pawls to permit the latter, when actuated, to come into engagement with the line-space wheel at various positions in the range of movement thereof, a regulator connected to said guard, a fixed guard for the other pawl which permits the latter to engage its associated line-space wheel always at the same. position in its range of movement, and means connected to said regulator to permit only one pawl at a time to come into engagement with its associated line-space wheel.

13. The combination of a platen, two linespace wheels therefor, two line-space pawls, one for each line-space wheel, actuating means for said line-space pawls, a movable element for one of said pawls to permit the latter, when actuated, to come into engagement with the line-space wheel at various positions in the range of movement thereof, a regulator connected to said element, a fixed element for the other pawl which permits the latter to engage its associated linespace wheel always at the same position in the range of its movement, and a slide actuated by said regulator to permit only one pawl at a time to come into engagement with its associated linespace wheel, said slide comprising two rests and a depression between said rests.

14. The combination of platen, two linespace wheels therefor, two line-space pawls, one for each line-space wheel, actuating means forsaid line-space pawls, a regulator to .vary the working range of one of said pawls, and means actuated by said regulator to selectively render any one of said pawls effective with its associated line-space wheel.

two line-space 15. The combination of a platen, two linespace wheels therefor, two line-space pawls, one for each line-space wheel, actuating means for said line-space pawls, a regulator to control the working range of one of said pawls, and means actuatable by said regulator to selectively render any one of said pawls effective with its associated linespace wheel, said last-mentioned means comprising a slide underneath said pawls, and a cam member extending at right l, angles to and engaging with said slide, the latter being connected to said regulator.

16. The combination of a platen, two linespace wheels therefor, two line-space pawls, one for each line-space wheel, actuatlng means for said pawls, a movable element to permit one of said pawls to come into engagement with the line-space wheel at various positions in the range of its movement, a fixed element to permit the other pawl to comev into engagement with its associated line-space wheel always at the same position in its movement, a regulator, a lost-motion connection between said movable element and said regulator, and means controlled by said regulator to render either one of said pawls effective.

17. rThe combination of a platen, two linespace wheels therefor, two line-space pawls, one for each line-space wheel, actuating means for said pawls, a settable element to permit one of said pawls to come into engagement with the line-space wheel at various positions in the range of its movement, a fi'xed element to permit the other pawl. to come into engagement with its associated line-space wheel always at the same position in its movement, a regulator, a lost-motion connection between said settable 4element and said regulator, means controlled by said regulator to render either one of said pawls effective, a spring against the tension of which said settable element is moved, and means to maintain saidelement in any position to which it may be moved.

1S. The combination of a platen, two linespace wheels therefor, two line-space pawls,

one for each line-space wheel, actuating mea-ns for said pawls, a settable element to permit one of said pawls to come into engagement with the line-space wheel at various positions in the range of its movement, a fixed element to permit the other pawl to come into engagement with its associated line-space wheel always at the same position in its movement, a regulator, a lost motion connection between said .settable element and said regulator, means controlled by said regulator to render either one of said pawls effective, a spring against the 'tension of which said settable element is moved, and a detent for said regulator to maintain said regulator and said settable element contion in its movement, a regulator movable to a plurality of positions, said movable element being controlled by said regulator, shiftable means controlled by said regulator to render either one of said pawls effective, the number of positions to which said regulator may be moved being greater than the number of positions to which said movable element may be moved, and a lost-motion connection between said movable element and said regulator.

20. The combination of a platen, two linespace wheels therefor, two line-space pawls, one for each line-space wheel, actuating means for said pawls, a movable element to permit one of said pawls to come into engagement with the line-space wheel at various positions in its range of movement, a fixed element to permit the other pawl to come into engagement with its associated line-space wheel always at the same position in its movement, a regulator movable to a plurality of positions, said movable element being controlled by said regulator, shiftable means controlled by said regulator to render either one of said pawls effective, the number of positions to which said regulator may be moved being greater than the number of positions to which said movable element may be moved, a lost-motion connection between said movable element and said regulator, and' means for maintaining said movable element, 'said regulator, and said shiftable means in the positions to which they may be moved.

21.l The combination of a platen, linespacing mechanism comprising a plurality of line-space wheels, a plurality of detents, one for each line-space wheel, means selectively rendering any one of said detents effective with its associated line-spade wheel, and means for rendering all of said detents ineffective, including a single cam and means whereby said cam may effect withdrawal of all of said detents concomitantly.

22. rl`he combination of a platen, a plurality of line-space wheels for said platen, a plurality of line-space pawls, one for each line-space wheel, means for actuating said pawls, means for rendering any one of said pawls effective with its associated line-space wheel, and means to prevent overthrow of said platen, the means for rendering said paivls effective being also effective to shift said overthrow-preventing means into cooperative relation with any of said paivls.

23. The combination of a platen, a plurality of line-space wheels for said platen, a plurality of line-space pawls, one for each line-space wheel, means for actuating said pawls, a finger-piece to render any one of said pawls effective with `its associated linespace wheel, and means comprising a slide to prevent overthrow of said platen, said finger-piece being effective t0 shift said overthrow-preventing means into coperative relation with any one of said paWls.

24. The combination of a platen, a plurality of line-space wheels on said platen, a plurality of line-space pawls, one for each line-space Wheel, means for actuating said paivls, a finger-piece to render any one of said pawls effective With itsassociated linespace Wheel, means comprising a cam to prevent overthrow of said platen, and projections on said pawls, said finger-piece being effective to shift said cam into coperative relation with the projection on the pawl being rendered effective.

25. The combination of a platen, a'plurality of line-space Wheels for said platen, a-

plurality of line-space pawls, one for each line-space wheel, means for actuating said pawls, a regulator for determining the extent of line-space movement of said platen, means connected to said regulator to selectively render any one of said pavvls effective, a plurality of detents, one for each line-space Wheel, means connected to said regulator to select and render the corresponding detent effective, and a detent on said regulator to maintain said paWl-selecting means and said detent-selecting means in the positions to which they may be moved.

26. The combination of a platen, a plurality of line-space wheels for -said platen, a plurality of line-space pawls, one for each line-space wheel, means for actuating said pawls, a regulator for determining the eX- tent of line-space 'movement of said platen, means connected to said regulator to selectively render any one of said pavvls effective, a plurality of detents, one'for each line-space Wheel, means connected to said regulator for rendering the corresponding detent effective, a movable guard associated with one of said pawls, said movable guard being controlled by said regulator, and a detent on said regulator to maintain said guard, said paWl-selecting means and said detent-selecting means in the positions to which they may be moved.

27. The combination of a platen, a plurality of line-space wheels for said platen, a plurality of line-space pavvls, one for each line-space Wheel, means for actuating said pawls, tent of line-space movement of said platen, means to selectively render any one of said pawls effective, a stop to prevent overthrow of" the platen, said stop and the means for rendering said pawls effective being controlled by said regulator, a plurality of detents, one for each line-space Wheel, means connected to said regulator for rendering the corresponding associated detent effective, a movable guard associated With one of said pawls, said. movable guard being controlled by said regulator, and a detent on said regulator to maintain said guard, said pawlselecting means, said stop, and said detentselecting means in the positions to which they may be moved.

BURNHAM C. STICKNEY.

Witnesses:

CATHERINE NEWELL, EDITH B. LIBBEY.

a regulator for determining the eX-- 

